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BTI variability of SRAM cells under periodically changing stress profiles

: Giering, Kay-Uwe; Lange, André; Kaczer, Ben; Jancke, Roland

Postprint urn:nbn:de:0011-n-4458759 (322 KByte PDF)
MD5 Fingerprint: e06b4f6747ae4d75580f5bfbd49c82a7
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Erstellt am: 31.5.2017

Institute of Electrical and Electronics Engineers -IEEE-; IEEE Electron Devices Society:
IEEE International Integrated Reliability Workshop, IIRW 2016. Proceedings : October 9-13, 2016, S. Lake Tahoe, California
Piscataway, NJ: IEEE, 2016
ISBN: 978-1-5090-4193-0
ISBN: 978-1-5090-4192-3
ISBN: 978-1-5090-4194-7
5 S.
International Integrated Reliability Workshop (IIRW) <2016, Lake Tahoe/Calif.>
European Commission EC
FP7; 619234; MoRV
Modelling reliability under variability
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IIS, Institutsteil Entwurfsautomatisierung (EAS) ()

We present a BTI compact model that is able to account for the complex BTI stress patterns encountered in complex electronic circuits. Such stress patterns are composed of various blocks corresponding to different circuit operation states, protocol modes or input conditions, and the blocks repeat within a composite, hierarchical structure. The present work extends a previously introduced physics-based accurate NBTI modeling while preserving its numerical efficiency. We provide insight into some principal characteristics of BTI degradation under hierarchical stress patterns, such as a non-trivial dependence on multiple duty cycles. In particular, the NBTI degradation can sensitively depend on the temporal sequence of NBTI stress blocks, and building a model on just the average stress or on stress histograms can be misleading. An SRAM cell example demonstrates this method and compares the cell's BTI failure statistics for two different hierarchic-periods stress patterns.